I have added metal strap buttons to most of my steel string acoustic guitars by drilling and screwing them into the heel area. I have one expensive guitar that I do not want to screw anything into, and this little device does exactly what it is intended to do very nicely. It fits around the headstock and I can securely fasten an ordinary long strap to it. The button for the strap offers quite a tight fit, but for added security you could also use the Harley Benton StrapMaster rubber "beer bottle top" type rings. It is fairly flexible leather that will get softer the more it is used and seems to be quite good quality leather for the small price.